function getUrlParameter(name) {
  name = name.replace(/[\[\]]/g, '\\$&')
  var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)'),
    results = regex.exec(window.location.search)
  if (!results) return null
  if (!results[2]) return ''
  return decodeURIComponent(results[2].replace(/\+/g, ' '))
}
